/* for IPv6, UDP checksum is mandatory */
if (ND_TTEST_LEN(cp, length)) {
sum = udp6_cksum(ndo, ip6, up, length + sizeof(struct udphdr));
ND_TCHECK_2(up->uh_sum);
/* for IPv6, UDP checksum is mandatory */
if (ND_TTEST_LEN(cp, length)) {
sum = udp6_cksum(ndo, ip6, up, length + sizeof(struct udphdr));
ND_TCHECK_2(up->uh_sum);